View Render Hooks
viewClassNames - a ClassName Input for adding classNames to the root view element. called whenever the view changes.
viewDidMount - called right after the view has been added to the DOM
viewWillUnmount - called right before the view will be removed from the DOM
When the above hooks are specified as a function in the form
arg is an object with the following properties:
view- a View Object
el- the view’s root HTML element. not available in